HEF4521BT,653

Counter Dividers Overview

The HEF4521BT,653 is a 24-stage frequency divider and oscillator manufactured by Nexperia. It comprises a chain of 24 toggle flip-flops with an asynchronous master reset input (MR). The device supports three modes: crystal oscillator, external oscillator buffer, or RC oscillator. Counting advances on the HIGH-to-LOW transition of clock A2. Outputs from the last seven stages (Q18 to Q24) are available. Recommended supply voltage is 3 V to 15 V. Package is SO16 (SOT109-1), body width 3.9 mm. Operating temperature range is -40 °C to +85 °C.

Counter Dividers Feature Summary

• Supports crystal, external oscillator, and RC oscillator configurations via dedicated input circuitry.
• Provides outputs from the final seven stages for flexible frequency division applications.
• Features fully static operation and high noise immunity with standardized symmetrical output characteristics.
• Includes ESD protection exceeding 2000 V (HBM) and 1000 V (CDM).

Counter Dividers Applications

• Frequency division circuits
• Oscillator designs using crystals or RC networks
• Digital counting systems

Counter Dividers Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature rating. Confirm that the component status aligns with current production requirements, as availability may change. Ensure design compliance with JEDEC standards and absolute maximum ratings during integration.

Counter Dividers Selection Notes

Select this component when a 24-bit binary counter or frequency divider is required within a 3 V to 15 V supply range. Consider the availability of intermediate stage outputs if specific division ratios are needed. Verify thermal management capabilities against the specified power dissipation limits for the target operating environment.

Counter Dividers Part Context

This part belongs to the HEF4521B series, which includes variants in different packages such as SOP and TSSOP. The BT suffix indicates the SO16 plastic small outline package version. Other series members may offer alternative pin configurations or package styles while maintaining similar electrical functionality.

Counter Dividers Replacement Considerations

Direct replacements include other HEF4521B variants with compatible packages. Verify pinout compatibility and electrical specifications before substitution. Cross-reference with manufacturer documentation for equivalent parts in the same logic family.